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Engine Measuring

Engine Measuring. Vernier (Dial) Caliper. Useful because it can read inside and outside measurements. Use only as a “rough” guide. Add the reading on the blade to the reading on the dial. Micrometer. The most used measuring instrument in engine service and repair

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Engine Measuring

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  1. Engine Measuring

  2. Vernier (Dial) Caliper • Useful because it can read inside and outside measurements. • Use only as a “rough” guide. • Add the reading on the blade to the reading on the dial.

  3. Micrometer • The most used measuring instrument in engine service and repair • Each revolution of the thimble moves the spindle .025”. • The thimble is graduated into 25 equally spaced lines so …. • Each line represents .001”

  4. Crankshaft Measurement • Measure for out-of-round • Measure the journal in at least six different positions across the diameter at 60 degree increments. This should be done at the same horizontal position. • Subtract the highest from the lowest to factor out-of-round.

  5. Crankshaft Measurement • Crankshaft taper – measure the journal at two different horizontal positions across the journal and subtract to factor taper.

  6. Telescopic Gauge • Used in conjunction with a micrometer to determine the inside diameter of a hole. • The gauge is inserted until contact is present and then locked. • A micrometer is then used for measurement. • Use only if necessitated.

  7. Small (split)-ball Gauge • Similar to a telescopic gauge in that it is used in conjunction with a micrometer to determine the inside diameter of a hole.

  8. Small (split)-ball Gauge • The gauge is inserted until contact is present and then locked. • A micrometer is then used for measurement. • Used for small bores. • example: valve guide

  9. Split-ball Probe • More accurate than a split ball gauge • Often used for larger bores

  10. Feeler Gauge • An accurately manufactured strip of metal used to factor the gap or clearance between two components. • Used for: • Piston ring gap • Piston ring side clearance • Connecting rod side clearance • Warpage

  11. Straightedge • A precision ground metal used to check to flatness of a component. Used for: • Cylinder heads • Block deck

  12. Dial Indicator • Measures variations from zero. 14-21 • Used to check • Runout • Crankshaft endplay • Valve guide wear

  13. Dial Bore Gauge • The most accurate way to measure bore diameter, taper or out-of-round. • Gauge must be “set-up” and zeroed before usage. • Used for: • Cylinders • Main bores • Connecting rod bores • Bearing bores

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